Disk diamond dressing tool



c. J. KOEBEL DISK DIAMOND DRESSING TOOL Filed April 19, 1943 (Ittomeg Ia new and improved type of diamond dressing tool shoulders ii-d and lle.Because of the presence of these steps or shoulders ll-d and il--e onthe wheel it is necessary in step grinding to employ either a singlepoint tool or, if a multiple tool is employed, to have the-diamondsarranged in a singlerow lyingin a plane transverse to the axis of thewheel so that the diamond points on the tool may enter into, andproperly form, the

' contour of the shoulders; I l-d and ilfe..

invention will be understood more fully from the following more detaileddescription and by'reference to the accompanying drawing forming a parthereof wherein a. Fig. 1 is a plan view showing a tool of the.

present invention in position I for dressing a stepped grinding wheel. vFig. 2 is a view in side elevation with the grinding wheel broken awaytoshow only a fragmen tary part thereof.

Fig. 3 is an enlarged somewhat diagrammatic" view in side elevation ofthe dressing tool of the present invention to illustrate the. manner'inwhich the diamonds thereof may be successively presented to thedressing. tool to be dressed.

It is of the utmost importance in the use of to the wheel atthe properangle. It is found in actual practice that unless a diamond dressingtoolls positioned at an angle to the surfaceoi' the wheel being dressedthat there is a great tendency forthe tool to gouge into the wheel. whenthis' occurs'the grinding face of. the wheel is not any-marred so thatconsiderable additional dressing. thereof is. required to put it intoproper working condition, but when a diamond dressllllztOOlOl-IKESintothe wheel, the reaction force's are such that a heavy strain isplaced upon me diamond which tends either to break the diamond or todislodge'it entirely fromthe tool shank.

When the diamonds are dislodged from the tool shank they frequently maybe thrown a considerabl'e distance so that they are frequentlyirrevocably lost, and as the diamonds are quite expensive, it is highlyimportant that gouging of the tool into the wheel be obviated as far asposdiamond dressing tools that the too] be presented The tool of thepresent invention consists of I a tool shank providedwith a yoke2iconsisting of the spaced laws 22, 23. provided-with a three led holefor the reception of the threaded end o. a cap screw 24. the jaw '22having a through, or unthreaded hole, for said screw, .Mountedon thescrew 24 and within the space between the laws 22, 22 isthe diamonddressing tool 25 of the present invention. The tool 25' is in the formof ,a narrow wheel, or flat cylindrical disk having a plurality ofdiamonds embedded in, the material of. the disk 25 and projecting fromthe periphery thereof. Thedisk 251s preferably constructed of sinteredmaterial consisting of a mixture of powdered metals, such as describedin the co-pending patent application of Lindqvist-Martin, Serial No.435,702. 'The diamonds 26 are suitably arranged in equally spaced jrelationship around the periphery of the disk,

when. the metals are in powdered form after' which the metal powder issintered and pressed. simultaneously into a compact, coherent and rigidJ form with the diamonds firmly embedded therein and secured to the diskso that they project radially from theperiphery-thereo! tosubstantiallythe same extent-and. along substantially in the same circumferentialline. The present invention' however is not limited to the settingmethod described above. as 'thediamonds may be secured to the disk byother sintering methods or bycastsible. -It has been found in practicethat a dra angle varying from 3 to 15 degrees, in accordance withcircumstances, gives the most satisfactory results. The showing of Fig.2 in the drawing whereinthe arrow indicates the direction'of' roisinclined downwardly from a line normal to the circumference'of the wheelat the point of contact of the tool with the wheel illustrates the dragangle referred to. p

The types! grinding known as form grinding or step grinding and whereinthe grindingwheel is dressed toa pre-determined contour tocorrep nd tothe finished contour of a workpiece to ,be fabricated presents differentproblems with respect to the dressing of the grinding wheel than areencountered when a grinding wheel havinsr a straight cylindrical contourisemployed. As the tool of the present invention is particularly adaptedfor the dressing of grinding wheels for either form or step grinding, aswell as for ordinary straight cylindrical grinding wheels-the tool hasbeen shown in the drawing in connection with a step grinding wheel. Asshown in Fig. l, the

tation of the wheel Ii and wherein the tool 20 4 theiaw 22 of the yoke2|, the inner end ofthe grinding wheel ii is indicated as being providedwith three cylindrical grinding surfaces I l-a, i i--b and I i-cofdifferent diameter which results in the formation on'the wheel of thesteps or ing, brazing or peening the diamonds into a suitable-metaldisk.

One side face of the disk-2B preferably'has formed thereineither. duringthe pressing and sintering operation, or by. any other suitable method,a plurality of grooves 21, or drill spotted depressions. there being thesame. number of groovesin the side face of the wheel as therearediamonds in the periphery thereof. The grooves 21' are intended tofunction as locating means to insure thatthe wheel will be held inproper position relative to the diamonds provided in the face of thewheel and for this purpose suitable means such, for example, as thescrew 22 is provided in screw 22 having a reduced tip 22 adaptedtoengage within the grooves 21. a v The manner in which the dressingtool is em ployed is as follows:

The disk 26 being mounted within the yoke 2'l is adjusted to bring oneof the grooves 21 in alignment with the pointed tip 29 of the screw 28after which the screw 24 is tightened to secure the disk rigidly betweenthe laws 22, 22 of the yoke, the

clamping action of the inner faces of the jaws 22, 22 against the sidefaces of the disk and the engagement of the pointed end 29 of the screw22 with the groove 21,- holding the disk securely againstrotation. Thegrooves 21 are positioned relatively to the diamonds 20 so that when thetool is'presented to the grinding wheel Ii at the proper drag angle, asillustrated in Fig. 2, two diamonds simultaneously attack, or engage theface of the wheel. 'When, after a certain period of use,the diamondshave been worn flat. or dull.

the screw 24 is loosened and thedisk 2| is turned The law 23 is.

tion (assuming that the wheel is originall'yzpro vided with 32 diamonds)or the equivalent oftwo to bring into engagement-with the" pointed. end

assoaer 29 or the screw 2. the groove 21 which isfspaced twogrooves-from the one with which the screw 2|! formerly was engaged.

The manner in which the diamonds are successively brought intoengagement with the grind- 1 ing, wheel can perhapsbest be understood byreference to the enlarged: view Fig. 3 ofQthe, drawing wherein thegrinding wheel [Land the diamond dressing tool. arerespectivelygillustrated by theg numerals II and 25, the points"A, Brepresentthe location of two of the diamondsoi toolll. which may beassumed tohavez; been originally employed at the beginning 01' use notthetool After the two diamondslocated at points A and B have been worntosuch anextent thatthey no longer work eflectively, the screw .24 isloosened and the wheel 25 rotated through ,4 of a revolu grooves2|;-this:will bring the diamonds atlthfe points indicated at c and Binto operative posi-i tion to engage the face of the grinding wheel H;

3 comprising 'a tool shank havingat'lone end thereof; opposed clampingmeans a fla t cylindrical-v shaped disk carried byLsaid clamping means,a

Thisv operation isrepeatedin equal increments] aroundthe receioithetdisk until the diamonds located at the points, E and! have beenused,

after which the tool','.or disk, will-then herefaced! the tool arepressed or the grinding wh n; 1 t

Having thus described my, invention sire to secure by Letters Patent is:

1. A diamon'ddressing tool. omprising anar- *row cylindrical diskcarrying a number of small diamonds arranged in 'substantially'equallyspaced relationship around, and projecting, partially irom,theflperlphery of said disk, and means for to present more than onediamond contact simultaneouslyto said wheel,- the spacing oi.-saldjhold- \ing meansrelative' tojthe spacing oi-saiddiamonds beingj'suchjthat uponsubsequent settings of saidfdisktore presentiany one-oisaid diamonds tojsald' wheels it will bein a different;

angular position "thaniln its immediately "preceding operable setting. r2. A diamond tool for dressing a grinding wheel plurality ofismall'fdiamonds arrangedin substantially I equally spaced, relationshiparound, and

' projectingfpartiallyjfrom, the-periphery of said.

tated only through /52 or a'revolution whichewill bring the diamondslocated at the pointsE and'jA' into operative position, thus, pr nling"them to the face of the grinding ,wheel at a diflerentang'le.

ffrom that in which they were formerly used.

After the diamonds atEandA have beenagain.

worn down in their new position of use, the wheel isnext again rotatedthrough lit ora revolution I as before, or the-equivalent of twogrooves. 21 to disk, means-for tightening said cla'mpingmean'sagainst.the side rete t: said disk tojliold the f same against rotation duringa, wheel dressing: operation, saiddisk and said clamping means heingprovided with inter-engaging locking means toserve to, locate said diskwith at least a pair I of said diamonds in'proper pre-determinedrelabring the diamonds B and C in operative position i 7 After the disk25 has been rotated through a comr plete 360 degrees of angular rotationback to the point where the diamonds E and A- are again pre- 1 sented,the tool is then movedto bring the diamonds A- and B again intopositions to engage the ,face or the grinding wheel that was occupiedby- 4 them in the first use of the tool,

3 these two diamondswould 'be worn 'to such an tionship to engage}thejface of'the'wheel to be dressed and to hold. said disk' againstrotation during the dressing operation, and said interengaging meansbeing so arrangedrelativelyfto the-spacing of 'saiddiarnon ds'lthat themembers of each pair of diamonds which engage the wheel on each settingwill be different, after eachcomplete rotation of said disk, from thosewhichengaged the wheel in each setting of said disk during suchrotation.

3; A diamond tool for dressing a grinding wheel comprising a tool shankhaving at one end there-- of a yoke consisting of a pair of clampingjaws,

i a flat cylindrical shaped disk mounted between said clamping jaws, aplurality of small diamonds arranged in a single row in equally spacedrelationship around, and projecting from, the face Due tothe fact thatthe diamondsA andB in j the second use of the tool were presented to thewheel in different relative positions. than that in which they stoodin'their first use, the faces or of said disk, at least one of the sidefaces of said disk and at least one of said jaws, being provided withcooperating, inter-engaging locking meansv to serve to bring at least apair of said diamonds simultaneously into operative relationship withangle that they will again present new sharp and effective cutting edgesof the tool when re-set =fi back to their original positions.- 1 v 4 Itwill be understood that the present'tool is firmly held against rotationwhen used to perform a wheel dressing operation and that due to thecircular or cylindrincal outer periphery of the tool, and the re-settingmovement oritthrough the small amounts of angular rotation results inpresenting the diamonds which engage the wheel to the wheel at adifferent drag angle after 'each' re-setting than that at which theywere pre-' sented at the former setting. It will therefore be understoodthat the present tool,'and the manner in which-it is to be used, is tobe distinguished from the use or a plurality of small diamonds mountedwithin the face .of a disk which is mounted for rotation in a toolholder and which,

1, is permitted to rotate when the diamondsinthe the face of thewheeltobe dressed and means for clamping said jaws against the side faces ofI 7 said disk and to hold said inter-locking means in engagement toprevent rotation of said disk during a wheel dressing operation, andsaid inter- ,engaging means being so arranged 'relativelyjto s thespacing of said diamonds that the members of each pair'oi diamonds whichengage the wheel on each setting will be different, after each completerotation of said disk, 'fromthose which ena ge the wheelin eachsettingof said disk dur 'ing such rotation. g

4. A diamond tool for dressing a grinding wheel comprising a tool shank,a fiat cylindrical shaped disk carried thereby, a plurality of smalldiamonds arranged substantially in' a cylindrical plane in substantiallyequally spaced relationship around and projecting partially from, theperiphery of said disk, said disk and clamping means each be- 3, againstthe periphery I whatI=deholding said 'disk. ag"ain st' rotation inadjusted; position Iordressing a grindingwheeland soras' ing providedwith inter-engaging indexing means arranged in definite Dre-determinedrelationship with respect to said diamonds so as to locate the membersof a pair of adjacent diamonds substa.n.. tially in equally spacedrelationship on each side of the plane passing through the center ofsaid disk and the center of the grinding wheel to be dressed with saidpair of diamonds in contacting operative engagement with the peripheryof said grinding wheel, and said inter-engaging means being so arrangedrelatively to the spacing of said diamonds that the members of each pairof diamonds which engage the wheel on each setting will we different,after each complete rotation of said disk, from those which engaged'thewheel in each setting of said disk during such rotation.

5. A diamond tool for dressing a grinding wheel comprising a tool shank,a flat cylindrical shaped disk carried thereby, a plurality ofsmalldiam-lnds arranged substantially in a cylindrical plane in substantiallyequally spaced relationship around, and projecting partially from, theperiphery of said disk, said disk and clamping means each being providedwith inter-engaging indexing means arranged in'definite pre-determinedrelationship with respect to said diamonds so as to locate the membersof a pair of adjacent diamonds substantially in equally spacedrelationship on each side of the plane passing through the center ofsaid disk and the center of the grinding wheel to be dressed with saidpair of diamonds in contacting operative engagement with the peripheryof said grinding wheel, and means for tightening said clamping means tohold said disk in indexed position, and said interengaging means beingso arranged relatively to the spacing of said diamonds that the membersing such rotation.

oi! each pair of diamonds which engage the wheel on each setting will bedifferent, after each complete rotation of said disk, from those whichengaged the wheel in each setting of said disk dur- 6. A diamond toolfor dressing a grinding wheel comprising a tool shank, a flatcylindrical shaped disk carried thereby, a plurality of small diamondsarranged substantially ina cylindrical.

plane in substantially equally spaced relationship around, andprojecting partially from, the periphery of said disk, inter-engagingindexing means carried by said disk and said tool shank, theinterengaging means on said'disk being arranged in definite predetermined equally spaced relationship to provide an index pointcorresponding to each of the diamonds carried by the periphery of saiddisk and cooperating with the inter-engaging means of said tool shank tolocate the members of an adjacent pair of diamonds in substantiallyequally spaced relationship on each side of a plane passing through thecenter of said disk and the center of said grinding wheel, and means fortightening said clamping disk to hold the members'of an'adjace'nt pairof diamonds simultaneously in contact with the periphery of the grindingwheel and against rotation during a, wheel dressing operation, and saidinter-engaging means being so arranged relatively to the spacing of saiddiamondsthat the members of each pair of diamonds which engage the wheelon each setting will be difierent, after each complete rotation of saiddisk, from those which engaged the wheel ineach setting of said diskduring such rotation.

CHARLES J. KOEBEL.

